Rapid solidification of Sr-contaminated soil by consecutive microwave sintering: mechanism and stability evaluation

Tang, Hexi; Shu, Xiaoyan; Huang, Wenxiao; Miao, Yulong; Shi, Minghe; Chen, Shunzhang; Li, Bingsheng; Luo, Fa; Shao, Dadong; Lu, Xirui

doi:10.1016/j.jhazmat.2020.124761

Cited by 38 publications

(8 citation statements)

References 29 publications

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“…The absorption peaks at ~725 cm −1 and ~673 cm −1 are ascribed to the stretching vibrations of Si-Al (Si) and Al (Si)-O bonds, respectively [23]. The remaining part of the spectrum contains the modes of the bending vibrations of O-Si (Al)-O bonds (around 610 cm −1 and 576 cm −1 ) and O-Si-O bonds (near 540 cm −1 and 420 cm −1 ), and the stretching vibrations of Sr-O bonds (near 540 cm −1 and 420 cm −1 ) [3]. Combined with the XRD results, the existence of Sr-O bonds indicates that feldspar strontian is present in the sintered samples.…”

Section: Microstructural Analysismentioning

confidence: 99%

“…Importantly, once the nuclide migrates into water or air through the soil, it will pose a great threat to human health and the surrounding environment. In recent years, especially after the nuclear accident in Fukushima, the safety of nuclear energy has been a greater public consideration [3,4]. In the Fukushima nuclear accident, large amounts of radioactive 90 Sr were released and deposited in the soil, resulting in chronic soil pollution [4,5].…”

Section: Introductionmentioning

confidence: 99%

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Coal Fly Ash as Raw Material for Immobilization of Sr-Contaminated Soil by Microwave Heating: Mechanism and Performance

et al. 2021

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In this work, coal fly ash, hereinafter CFA is proposed to work as raw material for immobilization of Sr-contaminated soil by microwave sintering in the path towards resource utilization of solid waste. The immobilization mechanism and performance was systemically investigated through phase evolution, microstructure, elemental distribution, and physical properties. The results shown that the Sr could be incorporated into feldspar strontian (SrAl2Si2O8) at 1300 °C for 30 min. Moreover, the maximum solid solubility of SrSO4 was more than 30 wt.%. The Sr was homogeneously distributed in the sintered matrices without substantial enrichment. The sintered matrix exhibited high density (2.53 g/cm3). Thus, microwave heating coupled with CFA could provide a new method for immobilization of Sr-contaminated soil in case of the spent nuclear reprocessing cycle in nuclear power plants or a nuclear accident emergency.

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Section: Microstructural Analysismentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Coal Fly Ash as Raw Material for Immobilization of Sr-Contaminated Soil by Microwave Heating: Mechanism and Performance

et al. 2021

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“…Due to its mature technology and large package volume, glass solidified waste has become the preferred treatment method for nuclear waste. Shu et al , used microwave sintering technology to successfully achieve in situ vitrification of uranium-contaminated soil (setting U: 5–50000 ug/g) at 1400 °C. In the vitrified forms, uranium was found to be surrounded by a three-dimensional network comprising silicon and aluminum oxide polyhedra.…”

Section: Introductionmentioning

confidence: 99%

“…23 Current nuclear waste immobilization is achieved by encapsulating the nuclear waste in a suitable matrix using chemical or physical encapsulation. It mainly includes cement solidified, 24 glass solidified, 25 ceramic solidified, 26 etc. Due to its mature technology and large package volume, glass solidified waste has become the preferred treatment method for nuclear waste.…”

Section: Introductionmentioning

confidence: 99%

Research on the Properties of Wasteforms after Direct Involvement of Uranium-Containing Silica Gel in Glass Network Formation

Qiu,

Cheng,

et al. 2024

Inorg. Chem.

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Uranium-containing silica gel (UCSG) is a secondary waste generated during the advanced treatment of nuclear wastewater. In order to reduce the growing storage pressure for UCSG, from the perspective of building a borosilicate glass network, UCSG was used to replace SiO 2 in the glass-cured formula to directly achieve the immobilization of UCSG. SEM-EDS results showed that uranium was uniformly distributed in the matrix, and the maximum solid solubility of UCSG (two components: silica gel and uranyl ions) in the formula was as high as 55 wt %. At the same time, TG-MS proved that silica gel lost OH groups (down about 4.61 wt %) and formed Si-O-Si bond by condensation. FT-IR and XPS proved a change in the number of Si-O-Si bond, and new Si-O-B and Si-O-Al bond appeared on the spectrum. This was evidence that silica gel could self-involved participate in the construction of glass networks. EPR analysis obtained the changes in the coordination environment of U atom, the U atom decreased spin electrons number in the glass than in uranyl crystals. The glass also has good physical properties (hardness: 6.51 ± 0.23 GPa; density: 2.3977 ± 0.0056 g/cm 3 ) and chemical durability (normalized leaching rate: LR U = 2.34 × 10 −4 ± 2.05 × 10 −6 g•m 2 •days −1 after 42 days), this research provided tactics for simple treatment of uranium-containing silica gel in one step.

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“…The alkaline earth aluminosilicates with the general formula MAl 2 Si 2 O 8 (M = Ca, Sr, Ba) are very important both for geology and material sciences. On the one hand, they relate to the feldspars, which are the most common minerals in the Earth's crust, on the other hand, they are applied as ceramic components [1-3], phosphorous (e.g., [4][5][6][7][8][9]), refractories material [10] and matrix for radioactive wastes [11][12][13]. According to the Commission on New Minerals, Nomenclature and Classification (CNMNC) of the International Mineralogical Association (IMA), only one mineral with the composition of SrAl 2 Si 2 O 8 , i.e., slawsonite, is known up to date.…”

Section: Introductionmentioning

confidence: 99%

Thermal Expansion and Polymorphism of Slawsonite SrAl2Si2O8

2021

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Slawsonite’s (SrAl2Si2O8) structure evolutions depending on temperature (27–1000 ℃) have been studied by in situ single-crystal X-ray diffraction. The SrO7 polyhedron expands regularly with the temperature increase. Silicon and aluminum cations are ordered in tetrahedral sites of the studied slawsonite; no significant changes in their distribution as temperature increases were observed. Slawsonite demonstrates a relatively high volume thermal expansion (αV = 23 × 10–6 °C–1) with high anisotropy, typical for framework feldspar-related minerals and synthetic compounds. It was found that, contrary to previously published data, the crystal structure of slawsonite is stable in the studied temperature range and no phase transitions occur up to 1000 °C. The role of Ca and Ba substitution for Sr and Al/Si ordering on polymorphism of natural MAl2Si2O8 (M = Ca, Sr, Ba) is herein discussed.

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Rapid solidification of Sr-contaminated soil by consecutive microwave sintering: mechanism and stability evaluation

Cited by 38 publications

References 29 publications

Coal Fly Ash as Raw Material for Immobilization of Sr-Contaminated Soil by Microwave Heating: Mechanism and Performance

Coal Fly Ash as Raw Material for Immobilization of Sr-Contaminated Soil by Microwave Heating: Mechanism and Performance

Research on the Properties of Wasteforms after Direct Involvement of Uranium-Containing Silica Gel in Glass Network Formation

Thermal Expansion and Polymorphism of Slawsonite SrAl2Si2O8

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